系统地研究了流延法制备SOFC阳极支撑体基片过程中影响流延浆料粘度和素坯质量的主要因素, 分析了球磨时间、有机混合溶剂类型、分散剂添加量、增塑剂/粘结剂比例(R)等参数以及除泡工艺对浆料流变性能的影响. 研究发现: 混合溶剂乙醇/二甲苯(体积比1:1)对粉料的湿润性能最好, 粉体的悬浮性能和浆料流变性能最佳; 分散剂添加量为1.8wt%时, 浆料的粘度最低; 研磨时间为24h制备的浆料流变性接近最佳状态; 浆料的粘度随R值的增大而急剧减小, 当R为1时粘度达到最佳值, 流变性能得到明显改善; 少量的除泡剂和真空搅拌对消除浆料制备过程中所产生的气泡极为有效.
Effects of the main factors which control the slurry rheological behavior and green tape quality of the tape cast SOFC anode support, including ball-milling time, organic solvent type, dispersant addition, plasticizer/binder ratio (R), and defoaming process as well, were systematically investigated. It is found the mixed solvent of ethanol and xylene (1:1 volume ratio) has the optimized wetting capability on the used ceramic powders, improving the suspensibility of powders and the rheology of slurry; the viscosity of the slurry decreases with addition of the dispersant and reaches the minimum at 1.8wt% of dispersant concentration; ball-milling reduces the slurry viscosity which approaches its lower limit after 24h of milling; the slurry viscosity decreases sharply with increase of the R value, and a minimum is obtained at R=1, the rheological behavior of the slurry is significantly improved; deforming agent and vacuum with agitation are effective on air bubble elimination.
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